Apparatus for treating paper-pulp.



G. C. HOWARD. APPARATUS FOR TREATING PAPER PULP.

APPLICATION FILED MAR. 31

Patented 112111.18, 1916.

6415 6, fiahma Immw- WITNESSES:

Arm/1MP v GUY G. HOWARD, OF EVERETT, WASHINGTON.

APPARATUS FOR TREATING PAPER-PULP.

- Specification of Letters Patent.

Patented Jan. 18, 1916.

Application filed March 31, 1915. Serial No. 18,251.

T 0 all whom it may concern:

Be it known that I, GUY C. HOWARD, a

-.-proved arrangement and design of feeding and discharging apparatus, together with improved means for dividing the discharge product of the beater so that a desired proportion is withdrawn and the balance is returned as regrinds for another passage through the beater. I accomplish this ob ject by devices illustratedin the accompanying drawings, in which Figure 1 is a view in longitudinal section of a continuous beater embodying my invention; Fig. 2 is a view .in verticalsection on broken line A,A of Fig'lfl; and Fig. 3 is a detached plan view of a discharge screen header embodied in my invention.

The beater essentially works on pulp or half stuff and further prepares it for subsequent processes by effecting a brushing out and hydrating of the individual fibers and sometimes a certain crushing or splitting of the fibers.

The ordinary beater, as used in paper mills, is intermittent in its operation, being adapted to be charged and run for a desired length of time and then emptied and refilled. My beater differs from this ordinary form of heaters in that it is con--- tmuous in its ope EltlOIl, discharges con stantly, instead of intermittently, and'is more economical of power used.

Referring to the drawings throughout which like reference numerals indicate like parts, 5 is the cylindrical barrel of a tube 11 being connected with a feed hopper or launder 13 and the discharge pipe 12 being connected with a discharge box 1%. The trunnions S and 9 are rotatably mounted in suitable bearings 15 and 16 and the mill is adapted to be rotated by a power-driven pinion (not shown) that engages with a circularrack 17 on the exterior of the mill.

lVithin the mill 5 near its intake end is a screen-plate 18 that is spaced apart from the head 6 to form a ch'unber 19 and is provided with a plurality of apertures 20 through which pulp may pass, the outer surface of the screen 18 having an integrally't'ormed water channel or passageway 21 that is connected with an axially disposed water supply pipe 22 and is provided with a plurality of apertures 23 through which water may be discharged into the chamber 19 and into the interior compartmentof the mill 5. a

A plurality of'studs 24 may be provided to extend between the plate 18 and the head 6 if desired, to brace the plate 18. The discharge end of the mill 5 is provided with a screen-plate 25 that is spaced from the head 7 to form a compartment 26, the plate 25 being provided with apertures 25 in its circular central area, as shown in Fig. 3, and formed with a radially disposed water channel 27 similar to the channel 21, and with radially directed ribs 28 which divide the chamber 26 into segmental cornpartments, and being concentrically connected integrally or otherwise with a helicoidal conveyer screw 29 that is adapted to be rotated within the pipe 12 by the turning of the mill to remove pulp discharged through the screen 25 and force such pulp upwardly througha pipe 30 into the disconducted through the lining of the mill 5 to a point or points approximately midway of the length of such mill to discharge water at such points. The water supply pipes 22 and 31 at opposite ends of the mill 6 are each provided with shut-off valve 33 and pressure gage 34, as shown'in Fig. 1. I he discharge box 1 1 is divided into two compartments 36 and 37 between which are provided a weir 38 over which pulp that is elevated through the discharge pipe 30 into the compartment 36 is adapted to flow to reach the compartment 37. Within the compipes 42 and 43 being connected: with thebottom of thecompartment 37 on eachside of .the divide block 39 to remove the pulp that is divided by the block 39, the pipe 42 conveying away a portion of such pulp 1 as finished material and the pipe '43 extending to and being connected with the feed pipe 11 at a point between themill 5 andthe launder 13 to convey a portion of the pulp back to the pipe 11 for another passage throng-lithe beater.

The launder '13 is located at a lower level than the discharge box 14 in order that the regrinds from the pipe 43 may enter the pipe 10 under a greater head than the fresh pulp and thus take precedence in its entry' to the machine over fresh pulp. The divide block 39 is provided with a centrally'located' nut 44 through which the screw 40 is threaded and has grooves on its two ends that slideon'tongues 45 provided in the sides of the compartment 37, as shown in Fig; 2.

The operation of my beater is as follows:

Material to be treated is fed into the mill through the pipe 11, together with a sufficient supply of. water,' such pulp passing through the apertures 20 in the screen 18 and being acted upon by pebbles or balls of the usual form that are provided within the mill, and issuing through-theapertures 25 into the chamber 26 where it is picked up by the helicoidal conveyer- 29 and elevated into the compartment36 of the dis.- ch-arge box 14 to flow over the weir 38 into the compartment 37 where a division of such pulp is made by the dividing block- 39, any desired proportion of the total discharge being returned to the feed pipe 11 through the return pipe 43 for another passage through the mill. After the mill is in operation, the divide block 39 may be ad;

justed by turning the screw 40 to take oif any desired proportion of the material discharged from the mill, it being possible in this way to effect a large number of passages of the pulp through the beater if ,de-

sired; however, inpractice, one-to three passages are usually found to be sui'licient and the method of mechanically dividing the' pulp as herein illustrated without attempt ing to grade the same, has proven very satisfactory.

The entrance'of the regrinds from the pipe 43 under a higher; pressure than the the regrinds 'will' alwa'ys have precedence V over the fresh ,pulp in entering the mill;

' The mill 5' is preferably filled withballs or pebbles to a height somewhat above the center' line, as shown in Fig. 1, as a large amount of pebbles not only balances the machine andreduces the amount of power required to rotate it, but also gives a greater volume ofthe, desired pebble action on the. i

Obviously, changes in details ,and arrangement of parts-embodied in *my beater pulp.

maybe 'made'without departing from the spirit'of my invention or sacrificing-any'fof its advantages. What'l claim, is 5 l 1. The combination with a mill forreducj ing paper pulp provided with inlet and out let openings for the'passage of the material, I

a supply receptacle for fresh material hav-, ing communication with said inlet opening, devices fordiverting the discharged, material from said outlet and returning it to said inlet opening intermediate said inlet opening and theconnection with saidereceptacle,

l and means for, regulating vthe proportions of said discharged materialreturned to the mill; I a a 2; The combination with: a rotatable mill having axially disposed I inlet andoutlet openings, of a receptacle for fresh pulp-com nected with said inlet opening, and devices for e1evatingaproportion of material dis charged from said outlet opening 'an'd"returning saidmaterial to said inletopening at a point between said receptacle for fresh pulp and said inlet opening and under a i a greater hydraulic head than said fresh pulp.

The combination'with a rotatable mill 'ha-vlng axially disposed inlet and outlet openings, of a feed inlet pipe connected with said discharge box to said feed pipe, said regrinds entering said feed-pipe at apoint between said mill and saidreceptacle for fresh pulp and under a greater hydraulic head than said fresh pulp. q

4; The combination with a rotatable mill having'axially disposed inlet and outlet openings, of a feed inlet pipe connected with said inlet opening, a receptacle for fresh pulp connected with said inlet pipe, a discharge box, a helicoidal screw conveyer rotatable in said discharge openingito convey pulp to -said discharge box, e mechanical means in said discharge box for dividing said pulpin any desired proportion, and a pipe for returning regrinds from said discharge box to said feed, pipe, said regrinds entering said feed pipe at a point between said mill and said receptacle for fresh pulp and under a greater hydraulic head than said fresh pulp.

5. The combination with a rotatable mill for-wet material, having inlet and outlet openings, of a receptacle for fresh pulp, a feed pipe connecting said receptacle for fresh pulp with said inlet opening, a discharge box located at a higher elevation than said receptacle for fresh pulp, a, discharge pipe connecting said discharge box with said outlet opening, means for elevating the discharged material to said discharge box, and a pipe for conveying material from said discharge box to said inlet pipe at a point between said receptacle for fresh pulp and said mill;

6. The combination with arotatable mill for wet material having inlet and outlet openings, of a receptacle for fresh pulp, a feed pipe connecting said receptacle for fresh pulp with said inlet opening, a discharge box located at a higher elevation than said receptacle for fresh pulp, a discharge pipe connecting said discharge ,box with said outlet opening, a helicoidal conveyer rotatable in said discharge pipe and connected with said mill to elevate material into said discharge box, and a pipe for conveying material from said discharge box to said inlet pipe at a point betweensaid receptacle for fresh pulp and said mill.

7. The combination with a rotatable mill having a discharge opening in its axis of' charge chamber, said screen plate having perforations provided in its circular central area for the passage of pulp from said com-.

partment to said chamber.

8. The combination with a rotatablemill' "having-a discharge opening in its axis of rotation, a screen-plate dividing said mill into a treating compartment and a discharge chamber, said screen-plate having perforations provided in its circular central area for the discharge of pulp, and having radially directed ribs on its outer surface.

adapted to elevate material above said outcharging chamber, said plate having perfora'tions provided in its circular central area and having 'a radially disposed Water channel adapted to emit water into said discharge chamber, and radially: directed ribs provided on the outer face of said screenplate.

10. The combination with a rotatable mill having an outlet opening, of a discharge box connected with said outlet opening, said discharge box being divided into two compartments and having a weir over tvhich liquidmaterial as pulp may flow from one to the other of said compartments, and a dividing block movable in one of said com- .partments in -a" direction crosswise of saidweir' to divide the overflow material from said weir in any desired proportion.

1 1. The combination with a rotatable mill having inlet and outlet openings, of a feed pipe for fresh pulp connected with said inlet opening, a discharge box connected with said outlet opening, saiddischarge box being divided into two compartments. and having a weir over which liquid material may flow from one to the other of said compart' ments, a dividing block movable in one of said compartments,- in" a; direction crosswise of said weir to divide the overflow material Y from saidweir in anv desired proportion, and a pipe for conveying a proportion of said]overfiow"material1back'to said feedpipe, said overflow' material entering said feed-pipe at a point nearer said inlet opening and under a greater hydraulic head than said fresh pulp. I

Signed at Montclair,. New Jersey, this 11th day of March, 1915.

a GUY o. Howann, Witnesses:

W. O. HENKE NEWTON Romans. 

